---
id: "CVE-2026-126940"
page: "https://infrastack.ai/live/CVE-2026-126940"
kind: "vulnerability"
aliases: ["CVE-2026-126940"]
title: "Zipline: rate limit bypass lets attackers guess passwords faster"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["package", "self-hosted", "zipline"]
not_affected_if: ["managed-hosting", "version-4.6.4-or-later"]
published_at: "2026-11-13T10:18:00+00:00"
first_seen_at: "2026-11-13T10:47:27+00:00"
updated_at: "2026-11-13T10:54:42+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-126940", "first_seen_at": "2026-11-13T10:47:27+00:00"}]
exploit_sources: []
---

# Zipline: rate limit bypass lets attackers guess passwords faster

Link for people: https://infrastack.ai/live/CVE-2026-126940 (this .md is for agents)

Zipline before 4.6.4 lets remote attackers evade login rate limits by varying query strings or sending an x-zipline-p-filename header. That allows unlimited password guessing against login and file or short-link password endpoints.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed Zipline version and see whether it is below `4.6.4`.
- Confirm whether the instance is reachable from the internet, since the bypass is remote.

## Fix

- Zipline: upgrade to `4.6.4` or later.

## Timeline

- 2026-11-13T10:47:27+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-126940

## Documents

- [advisory] Vendor advisory: github.com https://github.com/diced/zipline/security/advisories/GHSA-2qgq-hv52-jhqq
- [advisory] Third-party advisory: www.vulncheck.com https://www.vulncheck.com/advisories/zipline-before-4.6.4-rate-limit-bypass-via-query-string-and-header

## From the sources

Zipline before 4.6.4 contains a rate limit bypass vulnerability that allows remote attackers to evade request limits by varying query strings or supplying the x-zipline-p-filename header. Attackers can append differing query parameters to login and file or short-link password verification endpoints to perform credential guessing beyond the intended rate limits.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_